Answer:
Mean = 78.2
Standard deviation = 5.8
Step-by-step explanation:
Mathematically z-score;
= (x-mean)/SD
From the question;
12% of test scores were above 85
Thus;
P( x > 85) = 12%
P(x > 85) = 0.12
Now let’s get the z-score that has a probability of 0.12
This can be obtained from the standard normal distribution table and it is = 1.175
Thus;
1.175 = (85 - mean)/SD
let’s call the mean a and the SD b
1.175 = (85-a)/b
1.175b = 85 - a
a = 85 - 1.175b ••••••••(i)
Secondly 8% of scores were below 70
Let’s find the z-score corresponding to this proportion;
We use the standard normal distribution table as usual;
P( x < 70) = 0.08
z-score = -1.405
Thus;
-1.405 =( 70-a)/b
-1.405b = 70-a
a = 70 + 1.405b ••••••(ii)
Equate the two a
70 + 1.405b = 85 - 1.175b
85 -70 = 1.405b + 1.175b
15 = 2.58b
b = 15/2.58
b = 5.81
a = 70 + 1.405b
a = 70 + 1.405(5.81)
a = 78.16
So mean = 78.2 and Standard deviation is 5.8
Write a real-world problem with y=x(2)+2?
Answer:
Step-by-step explanation
the diving board is 2 ft then mike jumps 2 more ft off the diving board how high was mike off the ground after he jumped
Kirk had 33 points in the game before getting
–
18 points for losing control of his plane during a stunt.
What is Kirk's score now?
Answer:
15
Step-by-step explanation:
Before you answer did you mean
Minus 15 or negative 15?
Answer:
15
Step-by-step explanation:
33-18=15
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can somebody explain this to me ?, I’m having trouble .
Answer:
the sum of the two angles is 69. the angle labeled 2 is 17. all you gotta do is subtract 17 from 69, so 52 is your answer
CAN SOMEONE PLEASE HELP ME THIS IS DUE IN 20 mins!!
Answer:
A. w = 65 + d20 B. w = 30 + m15 C. 65 + (3)20 = 125(w) D. 8
Step-by-step explanation:
i dont now for certain if im right or wrong about C, please correct me if im wrong
Simplify the following expression:
Answer:
x4 y4Step-by-step explanation: I'm not sure if you need and step by step. But the 4's are the exponents.
Giselle’s youth club sells cookies to fund their trips and activities. Each year they need to earn $1,247 from selling cookies. For each box of cookies they sell, they make $1.45. If Giselle’s club has already made $472.70 from selling cookies, how many more boxes do they need to sell to meet their goal?
Answer:
534
Step-by-step explanation:
1247:1.45=860
472.7:1.45=326
860-326=534
Factorise: t3+t2+t+1
T6+1. you just need to add the same factors (T in this example) and since 1 doesn't have a "friend" it will be alone
Three times a number increased by 4 is 13.
show steps please brainliest if right
Given y = 2 - 6 if x = 2, what is the value of y
Answer:
im gonna assume you mean y=2x-6, if so the answer is -2 (multiply 2*2 then subtract 6)
if you really did mean y=2-6, then you would just subtract 6 from 2 and your answer would be -4
Please answer! I WILL MARK BRAINLIEST!!
Answer: is this an acute im confused
Step-by-step explanation:
Answer:
NOM, MON, 3, O
Step-by-step explanation:
Help pls it’s due today *photo*
9514 1404 393
Answer:
ACBD-BDAC
Step-by-step explanation:
It is convenient to compare the values of each of the functions when h=1. On the graphs, find 1 on the horizontal axis, then read the value of the function at that point from the vertical axis.
For the equations, the value for h=1 will be its coefficient in the equation.
__
1) a: 80,b: 50, c: 75, d: 30
Fastest to slowest is ACBD.
__
2) a: 4, b: 2, c: 8, d: 3
Slowest to fastest is BDAC
__
The code is these lists, separated by a dash: ACBD-BDAC.
If I get to watch my niece for 82 min. and then watch my little cuz for 67 min., how long do I watch both of them? Please include hours and minutes.
Answer:
2.5 hours roughly (2 hours 29 mins)
Answer:
1:49 is your answer. your welcome
if a = b, then ac = bc
1x + 6 = 3x + 8
Solve the equation.
Answer:
X = -1
Step-by-step explanation:
Step-by-step explanation:
collect like terms on one side
6-8=3x-1x
-2=2x
-2/2=x
-1=x
or
x=-1
Help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help help
Again
f(x)= -2x+1 {-2,0,2,4,6}
If x=-2, then -2(-2)+1 = 5
If x=0, then -2(0)+1 = 1
If x=2, then -2(2)+1 = -3
If x=4, then -2(4)+1 = -7
If x=6, then -2(6)+1 = -11
Answer:
B {5,1,-3,-7,-11}
Answer:
B
Step-by-step explanation:
-2(-2)+1
-2(0)+1
....
just plug the numbers in for x
BRAINLIEST FOR SURE JUST SHOW STEPS AND GET CORRECT 12 points
the quotient of a number and 3 is 10
Answer:
The answer is 30
Step-by-step explanation:
30 divided by 3 is 10.
Just multiply 3 and 10
Answer:
x = 30
Step-by-step explanation:
Quotient is division
Is means equals
x/3 =10
Multiply each side by 3
x/3 * 3 = 10 *3
x = 30
Kids on a field trip to a dairy farm are gathered in the barn with cows. If
there are 11 heads and 28 legs in the barn, how many kids and how many cows are
in the barn?
Vertical angles are supplements of each other
a. sometimes
b. always
c. never
Answer:
a sometimes
Step-by-step explanation:
Vertical angles are equal
If they both are 90 degrees, then they are supplements because they add to 180
So the correct answer is sometimes
Grace is comparing cell phone plans. A prepaid phone plan costs $0.20 per minute and has no monthly fee. A contracted phone plan costs $50 per month and $0.02 per minute. How will the graphs of the monthly costs of the two cell phone plans compare where x represents minutes purchased in a month?
The prepaid phone plan will have a steeper line and lower y-intercept.
The contracted phone plan will have the same steepness and a higher y-intercept.
The prepaid phone plan will have a less steep line and the same y-intercept.
The contracted phone plan will have a steeper line and same y-intercept.
Answer:
A (The prepaid phone plan will have a steeper line and lower y-intercept.)
Step-by-step explanation:
because i say so
The way the graphs of the two cell phone plans would be is The prepaid phone plan will have a steeper line and lower y-intercept.
How to solve for the intercept and the slopeThe price of the prepaid is $.20 per minute. This means that as the time goes on, the usage would rise hence a steeper line.
Given that there is no monthly fee for the prepaid, there would be a a smaller value for the y intercept.
Read more on this graph here:
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what is 4.08 as a fraction number
Step-by-step explanation:
As a mixed fraction:
.08 is 8/100.
[tex]4 \frac{8}{100} [/tex]
As an improper fraction:
[tex] \frac{(100 \times 4) + 8}{100} [/tex]
[tex] \frac{408}{100} [/tex]
Simplify by dividing the numerator by the greater common factor of 408 and 100, 4.
[tex] \frac{102}{25} [/tex]
PLZZZZZ Help I will Give Brainliest
The graph represents the journey of a bus from the bus stop to different locations: The title for the graph is Bus Journey. The label on the y-axis is Distance in miles, and the label on the x-axis is Time in hours. The graph shows 5 parts. The part labeled 1 is a smooth curve going up from the origin. The part labeled 2 is a straight horizontal line. The part labeled 3 is a smooth curve going down. The part labeled 4 is a straight horizontal line. The part labeled 5 is a smooth curve going up. Part A: Use complete sentences to describe the motion of the bus in parts 1, 2, 3, 4, and 5 of the journey. (4 points) Part B: In which parts of the graph is the function increasing, decreasing, and constant? (4 points) Part C: Is the graph linear or non-linear? Explain your answer. (2 points)
Answer:
See below
Step-by-step explanation:
A) In part 1, the bus is increasing in speed. In part 2, the bus keeps a steady pace. In part 3, the bus is slowing down. In part 4, the bus is once again keeping a steady pace. In part 5, the bus is increasing in speed once again.
B) Parts 1 and 5 are increasing, part 3 is decreasing, and parts 2 and 4 are constant.
C) This graph is non-linear. Linear means straight, and this graph is constantly increasing and decreasing. Thus, it is non-linear.
In the first segment, the bus picks up pace. The bus maintains its constant speed in segment 2. The bus is slowing down in part three. Part 4 finds the bus moving steadily once more. Part 5 sees the bus picking up pace once more.
What is coordinate geometry?A coordinate plane is a 2D plane that is formed by the intersection of two perpendicular lines known as the x-axis and y-axis. A coordinate system in geometry is a method for determining the positions of the points by using one or more numbers or coordinates.
A) In part 1, the bus is increasing in speed. In part 2, the bus keeps a steady pace. In part 3, the bus is slowing down. In part 4, the bus is once again keeping a steady pace. In part 5, the bus is increasing in speed once again.
B) Parts 1 and 5 are increasing, part 3 is decreasing, and parts 2 and 4 are constant.
C) This graph is non-linear. Linear means straight, and this graph is constantly increasing and decreasing. Thus, it is non-linear.
To know more about coordinate geometry follow
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5+8-3+5=? Help me out, this polyte person needs help
what is the answer to 3 - (-1)
Answer:
4
Step-by-step explanation:
Answer:
4
Step-by-step explanation:
you just subtract -1 from 3 and get the answer
a fence is 7 foot 6 inches high 1 foot=12 inches what is the height of the fence in centimetres
Given parameters:
Height of fence = 7 foot 6 inches
Unknown:
Height of fence in centimetres = ?
Also, 1 foot = 12 inches
This is a conversion problem. We are to take this height dimension to centimetres from the given values.
7 foot 6 inches;
We first convert the inches to foot;
12 inches = 1 foot
6 inches = [tex]\frac{6}{12}[/tex] = 0.5foot
Now, the given height in foot = 7 foot + 0.5 foot = 7.5foot
We then take this amount and convert to centimetre;
1 foot = 30.5 cm
7.5 foot = (30.5 x 7.5)cm = 228.75cm
The height is therefore, 228.75cm
Mike hiked to a lake in 5.5 hours at an average rate of 4 - miles per hour. Pedro hiked the same distance at
of A
3
a rate of 4 miles per hour. How long did it take Pedro to reach the lake? Round to the hundredths place.
5
It took Pedro
hours to reach the lake.
PLS HELP!!!!
Answer:3.1957 hours
Step-by-step explanation:
Bella brought candy to give
to 12 of her friends.
Each friend received 4
pieces of candy.
How many pieces of candy
did she bring to school?
Write an equation to determine how many pieces of candy Bella brought to
school?
PLEASE HELP
Answer:
1. 48
2. 12 x 4 = 48
Step-by-step explanation:
Bella has 12 friends and gave each of them 4 pieces of candy. So to find out how much candy she had, you have to multiply the friends by the candy she gave them.
What does the sentence 120+n=-60 tell you
Answer:
It tells me that n=-180
Step-by-step explanation:
Christian just lit a new candle and then let it burn all the way down to nothing. The length of the candle remaining unburned, in inches, can be modeled by the equation L=6−t where t represents the number of hours since the candle was lit. What is the slope of the equation and what is its interpretation in the context of the problem?
Given:
The length of the candle remaining unburned, in inches, can be modeled by the equation
[tex]L=6-t[/tex]
where, t represents the number of hours since the candle was lit.
To find:
The slope and its interpretation in the context of the problem.
Solution:
Slope intercept form of a linear function is
[tex]y=mx+b[/tex]
where, m is slope and b is y-intercept or initial value.
We have,
[tex]L=6-t[/tex]
It can be written as
[tex]L=6+(-1)t[/tex]
The coefficient of t is -1. So, using slope intercept form the slope of this equation is -1.
Here, -1 means length of the candle remaining unburned is decreasing at the rate of 1 inch per hour.
Is it true that 5 + 4 = 4 + 5 ? Explain why.
Answer:
Yes, it is.
Step-by-step explanation:
Its just reversed add 5+4 and its 9. Now add 4+5, its also 9.
a polygon has 6 sides the interior angle measures are 118°, 115°, 131°,118°,130° find the value of x PLEASE HELP I WILL GIVE BRAINLIEST
Answer:
X=108
Step-by-step explanation:
ASSUMING ITS A HEXAGON the sixth angle would be 108 degrees. You get this by adding all the five angles which give you 612. You then subract 612 from 720. Because 720 is the whole measure of a hexagon. and then when you subtract you get 108.n
